Granted Patent
Utility
US 5,154,892 · App. 07/731,504
Apparatus for achieving and maintaining an oxygen-deficient inert atmosphere within a treatment chamber
Inventors:
Gerhard Luhmann, Theodor Selbach, Jurgen Jachmann
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Jul 17, 1991
Inventors
Gerhard Luhmann
Theodor Selbach
Jurgen Jachmann
Assignee (at issue)
Th. Goldschmidt. AG
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.